Create JSON file programmatically

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[Free] Extension JsonUtils

thank you for your contribution which means, we now have this as well as the following Json Extensions CSV to Json encode Extension by Andres Daniel JSON Tools Extension by LukeGackle JSON Utils Extension by ColinTree JSON Decoding Extension by yamafu see also the extensions directory App Inventor Extensions | Pura Vida Apps Taifun

Then when you get the JSON, store it in a tinydb